Extension ringing arrangement key telephone system

Details Extension ringing arrangement key telephone system Extension ringing arrangement key telephone system

1986-02-18

1987-04-21

Dwyer, James L.

Telephonic communications

Multi-line or key substation system with selective switching...

Line status indication or call alerting

379156, H04M 302

Patent

active

046602194

ABSTRACT:
An extension ringing arrangement for a key telephone system wherein a plurality of key telephone sets are connected respectively through associated plurality of channel units to main equipment including a main CPU. The channel units as well as an interface unit, including a sub-CPU interconnected to the main CPU are connected in parallel to the main equipment. The interface unit is of the type used for interconnecting individual line telephone sets to the key telephone system, whereby a ringing of a selected one of the key telephone sets from a calling party is made possible, with a simple arrangement effectively utilizing existing components of the key telephone system.

REFERENCES:
patent: 4046972 (1977-09-01), Huizinga et al.
patent: 4196316 (1980-04-01), McEowen et al.
patent: 4490583 (1984-12-01), Bednarz et al.
patent: 4491693 (1985-01-01), Sano et al.
patent: 4564724 (1986-01-01), Nakayama et al.
patent: 4572928 (1986-02-01), Nishimura et al.

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